### R e : PPE C PS D P e rm i t A pp li c a t i on : P M BA C T f

o r t he C oo li ng S ys t

em

Roge r K ohn t

o: S t e v e H ill 05 / 23 / 2012 10 : 13 AM

C c: G e r a r do R i os

S t e v e,

T han k y ou f

o r t he add i t i ona l i n f o rm a t i on y ou p r

o v i ded on PM BA C T f

o r t he PPE C c oo li ng sys t

e m i n y ou r

5 / 16 / 12 l e tt e r

. Y ou r l e tt

e r p r o v i de s s o m e

, bu t no t a ll

, o f t he add i t i ona l i n f o rm a t i on t ha t we need t

o

c o m p l e t e ou r BA C T ana l ys i s and s end ou r d r a ft pe rm i t and f

a c t s hee t t

o O A Q PS f

o r r e v i ew

. T o he l p u s

p r opo s e t he pe rm i t s oone r

, we need add i t i ona l c l a r i f

i c a t i on on t wo i ss ue s.

I n y ou r l e tt

e r

, y ou s t

a t e t ha t y ou ha v e e li m i na t

ed d ry c oo li ng i n t

he BA C T ana l ys i s be c au s e “ t he r e a r e

t i m e s when t

he a m b i en t t

e m pe r a t u r e i n S an D i ego i s t

oo h i gh f o r a 100% a i r-c oo l ed sys t e m t o p r o v i de

s u ff i c i en t c oo li ng f

o r t he i n t e rc oo l e r sys t

e m t o s u s t a i n t u r b i ne pe r

f o rm an c e

. ” S i m il a r l y

, i n t he PS D

app li c a t i on ( p

. PS D -A pp

- 1

. 92

)

, y ou s t a t e t ha t “ T he m a i n t

e c hn i c a l i ss ue a ss o c i a t ed w i t h d ry c oo li ng

t owe rs f o r t h i s app li c a t

i on i s t he li m i t ed a v a il ab ili t

y t o p r o v i de adequa t

e c oo li ng unde r h i gh

- t

e m pe r a t u r e

c ond i t i on s

. T he p l an t w

ill u s e a P DC S i n a c l o s ed

- l oop c on f i gu r a t i on t ha t u t ili z e s d ry c oo li ng bu t a l so

r equ i r e s add i t i ona l c oo li ng c apa c i t

y

. F o r t he pu r po s e s o f t

h i s ana l ys i s

, d ry c oo li ng wa s e li m i na t ed a s a

po t en t i a l BA C T op t

i on f o r t he s e c ond s t

age o f t he c oo li ng sys t

e m be c au s e enhan c ed c oo li ng i s r equ i r ed

f o r t he p l an t be y ond wha t i s a l r ead y be i ng p r

o v i ded b y t

he d ry c oo li ng sys t

e m .”

W e be li e v e we m i gh t unde rs t and y ou r po i n t, howe v e r

, t he i n f o rm a t i on y ou ha v e p r

o v i ded i s no t s pe c i f

i c enough t o j u s t i f y e li m i na t

i ng d ry c oo li ng i n S t

ep 2 o f t he ana l ys i s on t

he ba s i s o f t

e c hn i c a l i n f

ea s i b ili t y

. B a s ed on y ou r s ub m i tt

a l

, i t appea rs t

ha t y ou a r

e a c t ua ll y t ry i ng t o e x p l a i n t

ha t d ry c oo li ng a l one i s no t

t e c hn i c a ll y f

ea s i b l e a ll t

he t i m e and m a y need t

o be s upp l e m en t

ed b y a t y pe o f we t c oo li ng when t he

a m b i en t t

e m pe r a t u r e e xc eed s a l e v e l t

ha t i s no t s t

a t ed i n t he do c u m en t

a t i on y ou s ub m i tt

ed

. P l ea s e

c l a r i f y i f t h i s i s t he c a s e

, t

he t e m pe r a t u r e a t wh i c h t

he d ry c oo li ng sys t

e m wou l d no t f

un c t i on

, how o ft

en

t ha t i s e x pe c t

ed t o o cc u r

, and how t

he s upp l e m en t

a l c oo li ng sys t

e m c ou l d be u s ed f

o r t ho s e s ho r

t pe r i od s

o f t i m e when t

he d ry c oo li ng sys t

e m a l one wou l d no t wo rk

. T hu s

, y ou wou l d p r o v i de t he ne c e ss a ry

i n f o rm a t i on t o e li m i na t

e d ry c oo li ng a l one

, bu t wou l d s how how d ry c oo li ng w i t h i n t e rm i tt en t u s e ano t

he r

c oo li ng sys t

e m wou l d be t

e c hn i c a ll y f

ea s i b l e

. As y ou ou t

li ne y ou r de c i s i on -m a k i ng f o r t he s e l e c t ed ( and

non -s e l e c t

ed ) c on t r o l op t i on

, p l ea s e d i sc u ss an y a ss o c i a t ed t r ade

- o ff s c on s i de r

ed

, s u c h a s en v i r

on m en t a l

and e c ono m i c t

r ade

- o ff s

, a s pa r t o f y ou r de s i gn and ope r a t i ng cr i t e r i a

.

A l s o

, i n y ou r 5

/ 16 / 12 l e tt e r

, y ou p r

e s en t a bu ll e t li s t o f c on t r o l t e c hno l og i e s f

o r t he BA C T ana l ys i s

, i n

de sc end i ng o r

de r o f c on t

r o l e ff e c t i v ene ss

. Howe v e r

, y ou d i d no t i n c l ude t he P a r t i a l D ry Coo li ng Sys t

e m (P DC S) t ha t PPE C p r

opo s e s t o u s e i n t

he i n i t i a l r an k ed li s t. T h i s m ean s t ha t i f on c e

- t

h r ough c oo li ng and

d ry c oo li ng a r

e e li m i na t

ed f r o m t he ana l ys i s

, we do no t k now i f t he P DC S i s t

he h i ghe s t r

an k ed r e m a i n i ng

op t i on

. If i t i s

, we do no t need t o e li m i na t

e t he o t he r r e m a i n i ng c on t

r o l op t i on s f r o m t he ana l ys i s

. If i t i s

no t, we m a y r

equ i r e add i t i ona l i n f o rm a t i on t o j u s t i f y e li m i na t

i ng an y o t

he r op t i on s t ha t a r e m o r e e ff e c t i v e

,

o r a s e ff e c t i v e

, a s P DC S

. P l ea s e p r o v i de a c o m p l e t

e li s t o f a ll c on t

r o l op t i on s y ou c on s i de r

ed i n t he

ana l ys i s

, r

an k ed b y c on t

r o l e ff i c i en cy.

T han k y ou.

Roge r K ohn

U SEPA Reg i on 9

- A i r D i v i s i on (A I R

- 3)

75 Haw t ho r ne S t r eet

S an F r an c i sc o

, C A 94105

- 3901

415

- 972

- 3973

k ohn

. r oge r @ epaS t

e v e H ill 05 / 16 / 2012 08 : 39 : 17 AM A tt a c hed i s a r

e s pon s e t

o a r eque s t f r o m EPA

...

F r o m: S t

e v e H ill < S H ill @ s i e rr

a r e s ea r c h

. c o m>

T o: G e r

a r do R i o s / R 9 / U SEPA / U S @ EPA

, "D a v i d J en k i n s ( d j en k i n s @ ape x po w

e r g r oup

. c o m) "

<d j en k i n s @ ape x po w

e r g r oup

. c o m>

, " M c K i n s e y

, J ohn A

. " < J A M C K I N SE Y @ s t oe l

. c o m>

, " M oo r

e

, S t e v e " < S t e v e

. M oo r

e @ s d c oun t

y

. c a

. go v>

, C c: R oge r K ohn / R 9 / U SEPA / U S @ EPA

, G a r

y R uben s t

e i n < G R uben s t

e i n @ s i e rr

a r e s ea r c h

. c o m>

, M agg i e F i t

z ge r a l d < M F i t

z ge r a l d @ s i e rr

a r e s ea r c h

. c o m>

, " < C r

a i g

. K ebodeau x @ k i e w

i t. c o m> "

< C r a i g

. K ebodeau x @ k i e w

i t. c o m>

, Mi c hae l K i ng < m p k i ng @ ape x po w e r g r oup

. c o m>

, " F o s t

e r

, M e li ss a A

. " < m a f

o s t e r @ s t oe l

. c o m>

, "H e ll w

i g

, K i m be rl y J

. " < k

j he ll w i g @ s t oe l

. c o m>

D a t e: 05 /

16 / 2012 08 : 39 AM

S ub j e c t: PPE C PS D P e r m i t A pp li c a t i on : P M BA C T f

o r t he C oo li ng S ys t

em



### A tt a c h e d i s a r e s p o n s e t o a r e qu e s t fr o m E P A a b o u t P M B

A C T f o r t h e C oo li n g S y s t e m f o r t h e PP E C P

S D

P e r m i t a pp li c

a t i o n.

T h a n ks t o R o g e r f o r ar t i c u l a t i n g E P A ’ s n ee d f

o r a dd i t i o n a l i n f

o r m a t i o n a b o u t t h i s i ss

u e.

Do n o t h e s

i t a t e t o c o n t a ct m e i f y

o u h av e a n y qu e s

t i o n s.

[ a tt a c h m e n t " C oo li n g S y s t e m B A C T l e tt e r 05

- 16

- 12

. pd f " d e l e t e d b y R o g e r K o hn / R 9 / U S E P A / U S]